Soccer mom Yvette Palmer lives an ordinary life in San Antonio, Texas when a box is delivered to her by mistake, and in taking it to its rightful owner—a crotchety neighbor named Mona who shares her back fence—is drawn into a strange and haunting tale.

Mona’s ratty robe, mood swings, and secretive behavior all raise red flags, and Yvette is sure someone else is living there despite Mona’s claim to live alone, but Yvette is unable to break away as she listens to how Mona transformed from a young college woman about to be married to the odd, reclusive, ghost of a woman she is now.

As Yvette listens to her neighbor's tale, she discovers a shocking connection, but doesn't know whether Mona's come to help or to harm her and her family.